get an access token from an email and a .pem file, either passed in or from environment variables

USAGE
$ sfdx shane:ai:auth [-e <email>] [-f <filepath>] [-t <integer>] [-l <string>] [--json] [--loglevel
trace|debug|info|warn|error|fatal|TRACE|DEBUG|INFO|WARN|ERROR|FATAL]
OPTIONS
-e, --email=email email address you used when you
signed up for your einstein.ai
account
-f, --certfile=certfile path to your private key from when
you signed up
-l, --level=local|global [default: local] where to store this
config
-t, --tokentime=tokentime [default: 1440] time in minutes that
you want your token to be valid for
--json format output as json
--loglevel=(trace|debug|info|warn|error|fatal|TRACE|DEBUG|INFO|WARN|ERROR|FATAL) [default: warn] logging level for
this command invocation
EXAMPLE
sfdx shane:ai:auth -e shane.mclaughlin@salesforce.com -f ~/code/certs/einstein_platform.pem
// reauths, and takes what it can get